CSDIC
UK: "Camp 11": High-ranking German and Italian
prisoners were held for months at the luxurious Engish
country mansion, Latimer House, in Buckinghamshire (now a
business conference centre). Every room, tree and
park-bench was equipped with hidden microphones.

CSDIC
(and others): German officers talk in Allied captivity
about Himmler and the SS, and are overheard and secretly
recorded